How severe is CVE-2023-4509?

CVE-2023-4509 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-4509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4509?

CVE-2023-4509 affects Octopus Octopus Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-4509?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-4509 have an EU (EUVD) identifier?

Yes. CVE-2023-4509 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-54364.

When was CVE-2023-4509 published?

CVE-2023-4509 was published on 2024-04-18 and last updated on 2026-06-17.

CVE-2023-4509

CVE-2023-4509 is a medium-severity vulnerability in Octopus Octopus Server with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-54364
Weakness: CWE-319
Affected product: Octopus Octopus Server
Published: 2024-04-18
Last modified: 2026-06-17

Description

It is possible for an API key to be logged in clear text in the audit log file after an invalid login attempt.

Frequently asked questions

What is CVE-2023-4509?: It is possible for an API key to be logged in clear text in the audit log file after an invalid login attempt.
How severe is CVE-2023-4509?: CVE-2023-4509 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-4509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4509?: CVE-2023-4509 affects Octopus Octopus Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-4509?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-4509 have an EU (EUVD) identifier?: Yes. CVE-2023-4509 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-54364.
When was CVE-2023-4509 published?: CVE-2023-4509 was published on 2024-04-18 and last updated on 2026-06-17.

References

https://advisories.octopus.com/post/2024/sa2024-02/

Affected products (1)

cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:*

More vulnerabilities in Octopus Octopus Server

CVE-2024-9194 — Critical (CVSS 9.8): Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Linux and…
CVE-2022-2572 — Critical (CVSS 9.8): In affected versions of Octopus Server where access is managed by an external authentication provider, it was possible…
CVE-2022-2778 — Critical (CVSS 9.8): In affected versions of Octopus Deploy it is possible to bypass rate limiting on login using null bytes.
CVE-2018-11320 — Critical (CVSS 9.8): In Octopus Deploy 2018.4.4 through 2018.5.1, Octopus variables that are sourced from the target do not have sensitive…
CVE-2026-0704 — Critical (CVSS 9.1): In affected version of Octopus Deploy it was possible to remove files and/or contents of files on the host using an API…
CVE-2022-2782 — Critical (CVSS 9.1): In affected versions of Octopus Server it is possible for a session token to be valid indefinitely due to improper…

All CVEs affecting Octopus Octopus Server →

Other CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities

CVE-2025-4378 — Critical (CVSS 10.0): Cleartext Transmission of Sensitive Information, Use of Hard-coded Credentials vulnerability in Ataturk University…
CVE-2025-47419 — Critical (CVSS 10.0): Cleartext Transmission of Sensitive Information vulnerability in Crestron Automate VX allows Sniffing Network…
CVE-2026-48902 — Critical (CVSS 9.8): The password and username reset features created plain http links for https connections if the "Force SSL" flag wasn't…
CVE-2025-34271 — Critical (CVSS 9.8): Nagios Log Server versions prior to 2024R2.0.2 contain a vulnerability in the cluster manager component when…
CVE-2025-32880 — Critical (CVSS 9.8): An issue was discovered on COROS PACE 3 devices through 3.0808.0. It implements a function to connect the watch to a…
CVE-2025-26199 — Critical (CVSS 9.8): CloudClassroom-PHP-Project v1.0 is affected by an insecure credential transmission vulnerability. The application…

Browse all CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities →